HAZARD MITIGATION PLAN UPDATE ANNEX FOR THE TOWN OF GROTON Southeastern Connecticut Council of Governments Multi-Jurisdictional Hazard Mitigation Plan Update January 16, 2013 MMI #3570-05 Prepared for: TOWN OF GROTON 45 Fort Hill Road Groton, Connecticut 06340 (860) 441-6630 www.groton-ct.gov Prepared by: MILONE &MACBROOM, INC. 99 Realty Drive Cheshire, Connecticut 06410 (203) 271-1773 www.miloneandmacbroom.com ACKNOWLEDGEMENTS This HMP annex update could not have been completed without the time and dedication of the following individuals at the local level: Michael Murphy, AICP Director of Planning and Development, Local Coordinator 134 Groton Long Point Road Groton, CT 06340 (860) 446-5995 (860) 446-5978 Fax [email protected] Joe Sastre Emergency Management Director Gary Schneider Director of Public Works Kevin Quinn Manager of Inspection Services, Planning and Development Services Deborah Jones Environmental Planner, Planning and Development Services HAZARD MITIGATION PLAN UPDATE ANNEX TOWN OF GROTON, CONNECTICUT JULY 2012 AK-1 TABLE OF CONTENTS Section Page 1.0 INTRODUCTION 1.1 Purpose of Annex..........................................................................................................................1-1 1.2 Setting ...........................................................................................................................................1-1 1.3 Plan Development.........................................................................................................................1-1 1.4 Progress Monitoring .....................................................................................................................1-2 2.0 COMMUNITY PROFILE 2.1 Physical Setting.............................................................................................................................2-1 2.2 Land Use and Development Trends..............................................................................................2-1 2.3 Drainage Basins and Hydrology ...................................................................................................2-2 2.4 Governmental Structure................................................................................................................2-3 2.5 Review of Existing Plans and Regulations ...................................................................................2-5 2.6 Critical Facilities, Sheltering Capacity, and Evacuation.............................................................2-10 2.7 Status of 2005 Plan Recommendations.......................................................................................2-13 3.0 INLAND FLOODING 3.1 Setting / Historic Record...............................................................................................................3-1 3.2 Existing Programs, Policies, and Mitigation Measures ................................................................3-1 3.3 Vulnerabilities and Risk Assessment............................................................................................3-2 3.3.1 Vulnerability Analysis of Areas Along Watercourses.............................................................3-2 3.3.2 Vulnerability Analysis of Private Properties..........................................................................3-4 3.3.3 Vulnerability Analysis of Critical Facilities...........................................................................3-5 3.4 Potential Mitigation Measures, Strategies, and Alternatives ........................................................3-5 3.0 COASTAL FLOODING & STORM SURGE 4.1 Setting / Historic Record...............................................................................................................4-1 4.2 Existing Programs, Policies, and Mitigation Measures ................................................................4-1 4.3 Vulnerabilities and Risk Assessment............................................................................................4-2 4.3.1 Vulnerability Analysis of Areas Along Watercourses.............................................................4-2 4.3.2 Vulnerability Analysis of Private Properties..........................................................................4-5 4.3.3 Vulnerability Analysis of Critical Facilities...........................................................................4-6 4.4 Potential Mitigation Measures, Strategies, and Alternatives ........................................................4-6 HAZARD MITIGATION PLAN UPDATE ANNEX TOWN OF GROTON, CONNECTICUT JULY 2012 TC-1 TABLE OF CONTENTS (Continued) 5.0 HURRICANES AND TROPICAL STORMS 5.1 Setting / Historic Record...............................................................................................................5-1 5.2 Existing Programs, Policies, and Mitigation Measures ................................................................5-1 5.3 Vulnerabilities and Risk Assessment............................................................................................5-2 5.4 Potential Mitigation Measures, Strategies, and Alternatives ........................................................5-3 6.0 SUMMER STORMS AND TORNADOES 6.1 Setting ...........................................................................................................................................6-1 6.2 Vulnerabilities and Risk Assessment............................................................................................6-1 6.3 Existing Programs, Policies, and Mitigation Measures ................................................................6-1 6.4 Potential Mitigation Measures, Strategies, and Alternatives ........................................................6-2 7.0 WINTER STORMS AND NOR EASTERS 7.1 Setting ...........................................................................................................................................7-1 7.2 Vulnerabilities and Risk Assessment............................................................................................7-1 7.3 Existing Programs, Policies, and Mitigation Measures ................................................................7-1 7.4 Potential Mitigation Measures, Strategies, and Alternatives ........................................................7-2 8.0 EARTHQUAKES 8.1 Setting ...........................................................................................................................................8-1 8.2 Vulnerabilities and Risk Assessment............................................................................................8-1 8.3 Existing Programs, Policies, and Mitigation Measures ................................................................8-1 8.4 Potential Mitigation Measures, Strategies, and Alternatives ........................................................8-2 9.0 WILDFIRES 9.1 Setting ...........................................................................................................................................9-1 9.2 Vulnerabilities and Risk Assessment............................................................................................9-1 9.3 Existing Programs, Policies, and Mitigation Measures ................................................................9-1 9.4 Potential Mitigation Measures, Strategies, and Alternatives ........................................................9-2 10.0 DAM FAILURE 10.1 Setting .........................................................................................................................................10-1 10.2 Vulnerabilities and Risk Assessment..........................................................................................10-1 10.3 Existing Programs, Policies, and Mitigation Measures ..............................................................10-2 10.4 Potential Mitigation Measures, Strategies, and Alternatives ......................................................10-3 HAZARD MITIGATION PLAN UPDATE ANNEX TOWN OF GROTON, CONNECTICUT JULY 2012 TC-2 TABLE OF CONTENTS (Continued) 11.0 RECOMMENDATIONS 11.1 Summary of Specific Recommendations....................................................................................11-1 11.1.1 Recommendations Applicable to All Hazards ......................................................................11-1 11.1.2 Recommendations Applicable to Inland and Coastal Flooding...........................................11-3 11.1.3 Recommendations Applicable to Wind Damage from Hurricanes, Tropical Storms, Tornadoes, and Winter Storms.............................................................................................11-6 11.1.4 Recommendations Applicable to Other Damage from Winter Storms .................................11-7 11.1.5 Recommendations Applicable to Earthquakes .....................................................................11-8 11.1.6 Recommendations Applicable to Wildfires...........................................................................11-8 11.1.7 Recommendations Applicable to Dam Failure.....................................................................11-8 11.2 Prioritization of Specific Recommendations ..............................................................................11-8 Tables Table 2-1 Critical Facilities............................................................................................................2-11 Table 3-1 Recent Inland Repetitive Loss Damage Claims in Groton ..............................................3-5 Table 10-1 Dams